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December 2015
Seeing I have 1000's of photos doing this job daily, I thought this one was pretty cool. A cracked concrete firebox floor allowed heat transference downward to the plywood subfloor. Pyrolysis had taken place over a long period of time, until it finally went to flaming combustion. They were using the fireplace daily, and especially during the cold winter months. They were watching TV when they smelled and then observed smoke venting up, through the flooring, near the fireplace hearth.
The photo shows clean-burn of the concrete fire box underside, and outward moving heat and flame degradation to the other wood floor and framing materials. The house was built in the 1970's in a very expensive community in San Mateo County. Fortunately there were no injuries. Most likely the concrete had become damaged from fireplace usage and seismic activity.
Submitted by Dennis Field, Fire Cause Analysis
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